P21E0Cylinder 3 Injector B Circuit Low
- Generic OBD-II code · Powertrain
- Turns on the check-engine light
- Matters for the ITP
- Can trigger limp mode
- How the car detects it
- P21E0 reports a low circuit state on the B injector of cylinder 3. Mitsubishi lists it for the 2022 Eclipse Cross as the direct injector code and does not use the open code P21D1, so an interrupted wire and a short to ground both end up here once they last 2 s. Its procedure measures the injector across its two DI terminals at the intermediate connector, then the harness on both sides of that connector, and only then suspects the ECM. Port injector faults on the same cylinder are P0267 and P0268. On GM's 2019 LT5 V8 cylinder 3 is the second cylinder on the left bank; its supplemental injector fails this test with less than 0.5 Ohm between low side and ground in 20 of 25 samples while the driver is off, Type A in one trip. Expect a cylinder 3 misfire; P21E1 is the high fault.
- What you may notice
- Check engine light on
- Misfire on cylinder 3 (P0303)
- Rough idle
- Likely causes
- LikelyCylinder 3 injector wire broken or shorted to ground
- PossibleInjector of cylinder 3 with open or shorted coil
- RareEngine control module output faulty
- Inspection (ITP)
- Matters for the ITP. While the check-engine light is on, the car fails the emissions check.
- Repair
- Hard · Usually a job for a workshop.Typical cost: €100 – €900
- Related codes
Explanation from obdex (CC0), exactly as the app shows it. Guidance only; confirm with a workshop.